The role of externalities and information aggregation in market collapse

We examine the role that belief, network externality, and information aggregation play in inefficient market collapses. After receiving consecutive negative shocks, some ex-ante identical Bayesian agents will be discouraged about the unknown state of the market they invest; therefore, they will stop investing. This decision will have two effects: first, it will cause agents to aggregate information through social/observational learning; second, it will decrease the network externality effect. We show that there might be an inefficient market collapse if the externality effect diminishes too much, and the cost of re-entry to the market is too high. We also analyze the effects of strategic delay and experimentation on the exit decision of the agents. I especially thank Thomas D. Jeitschko, Matthew Mitchell, B. Ravikumar Ted Temzelides. I also thank anonymous referees, an associate editor, John Conlon, Larry Samuelson, Troy Tassier, Stephen Williamson, and seminar participants of the University of Saskatchewan, Georgia Tech, Concordia University, University of Manitoba, Iowa Alumni Workshop, Midwest Economic Theory Conferences held at Indiana Bloomington, and Notre Dame, and 1st International Conference on Business, Management and Economics organized by Yasar University.     

Using Simulation and Data Envelopment Analysis to Compare Assembly Line Balancing Solutions

This paper presents a technique for comparing the results of different assembly line balancing strategies by using Data Envelopment Analysis (DEA). Initially, several heuristics--which can be thought of as assembly line balancing strategies--were used to solve seven line-balancing problems. The resulting line balance solutions provided two pieces of information that were of particular interest: the number of workers needed and the amount of equipment needed. These two items were considered inputs for DEA. The different line balance solutions were then used as layouts for simulated production runs. From the simulation experiments, several output performance measures were obtained which were of particular interest and were used as outputs for DEA. The analysis shows that DEA is effective in suggesting which line balancing heuristics are most promising.     

Optimization of postal express line network under mixed driving pattern of trucks

Details about the movement of trucks on postal express lines are investigated to improve the performances of mail distribution. A mixed driving pattern of trucks is introduced to minimize the transportation cost of a postal express line network with a service level requirement. We formulate this problem as a mixed p meeting depots location with shipment scheduling problem and build a MINLP model. A two-level tabu search procedure based on shipment grouping method is developed. Through a series of computational experiments and sensitivity analysis on different instances, some managerial insights of the network under mixed driving pattern are revealed.     

利用矢量网络分析仪测量时延特性的方法

解释了无线射频系统时延指标测量的意义及重要性,介绍了使用矢量网络分析仪进行时延指标测量的基本原理,归纳了网络分析仪进行线性器件、变频器件时延测量的测量方法,重点分析了变频器件时延测量的三种方法的原理、步骤和准确度.     

基于电力线载波通信的家电控制系统

电力线载波通信是用电力线路作为通信媒介进行数据传输。介绍了在低压配电线上用电力线载波专用芯片ST7536实现数据的传输,采用电力线载波形式,设计出了一个家电网络控制系统,对家电网络进行远程集中控制,可以对多路家用电器的运行情况进行实时监测和控制,并分析了电力线通信的通道特性及其干扰,结合电力通信的特点提出了解决办法。     

试论《儒林外史》的讽刺艺术

《儒林外史》是我国古代讽刺小说的奇文,其深刻的思想内容和高超的艺术技巧,为我国讽刺文学树立了典范.它的高超的讽刺艺术主要表现在以下几个特点:题材的真实性,描写的客观性;合理夸张性.同时采用了白描手法,给读者以想像和发挥的空间.     

基于单元星形光纤网的最大总光程及其求解方法

研究了单元星形光纤网中,最多光路数目与最大允许光链路损耗间的关系,推出了在给定最大允许光链路损耗、不同光路数目时各路总光程的求解方法,进而得到最佳光路数目与最大总光程,最终得出六条结论。     

基于后效晚点时间的机场机位容量评估研究

针对机场机位各种时间要素进行分析,以航班后效晚点时间作为机场机位服务质量的限定标准,并以此标准来确定平均必要缓冲时间,进而结合机型混合比、航班时段百分比等概念建立机场机位容量最优化模型。并以国内某大型机场作为实证分析,其结果具有一定的理论价值和实际意义。     

项目管理视角下政府与企业应对技术壁垒的协调机制

国外技术壁垒的应对是一个复杂的系统工程,政府和企业是这一系统中的主体,二者如何分工配合、协同应对是实现跨越的关键。本文应用项目管理的手段,在协同目标的基础上,通过工作分解及责任分配矩阵来设置跨越国外技术壁垒过程中政府与企业的协同关系,从而为我国建立跨越国外技术壁垒的协调机制提供一个新思路。     

中国轿车产业中的产品线扩展——模型分析与经验考察

产品线扩展是多产品企业的主要竞争手段之一,也是实证产业组织理论研究的重点内容。以中国轿车产业为背景,本文理论模型表明,一个成长产业中,产品线延伸可以提高企业市场占有率和盈利能力,而合资企业在取得产品线扩展先动优势时,还获得了品牌价值的升水,长期竞争的结果是产品线的重叠和趋同。基于中国轿车产业的实证分析在一定程度上证明了理论假设的存在,本文还提出了本土企业优化产品线的策略性建议。